Dog collar



FIG. 1 is an isometric view of a dog collar showing my new design;

FIG. 2 is a plan view of the dog collar of FIG. 1; and,

FIG. 3 is an elevational view of the dog collar of FIG. 1.

The broken lines in FIG. 1 are for illustrative purposes only and form no part of the claimed design. 

The ornmental design for a dog collar, as shown and described. 